Here is a video of Turner Motorsport's impressive E92 M3 coupe build, after a complete stripdown and buildup for dedicated track use. It's a track car built for a customer.

Description from Turner Motorsports:E92 M3 Customer Track Build - This customer car was built to order as the owner's weekend track MONSTER. The car is a 2008 E92 M3 Coupe, which originally came with a sunroof (that had to go!) This gallery follows a start-to-finish build up, including stripping of the interior, full cage fabrication, paint, reassembly, safety system installation, full Moton suspension, and much, much more.